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posted by Anonymous on Tuesday, March 20, 2012 at 8:08pm.
if y vaires directly as x^2 and y=20 when x=4, find y when x=7? I got 61.25 but was not sure if it was correct...
y = kx^2 20 = k*16 k = 5/4 so, y = 5/4 x^2 y(7) = 5/4 * 49 = 61.25 Good job.
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